Title :
60 Watt Doherty amplifiers using high gain 2-stage hybrid amplifier modules
Author :
Crescenzi, E. James, Jr. ; Pengelly, Raymond S. ; Wood, Simon M. ; Buss, Robert E.
Author_Institution :
Cree Microwave Corp., Sunnyvale, CA, USA
Abstract :
A Doherty amplifier has been constructed using small surface-mount 2-stage 30 W hybrid amplifier modules. These modules offer higher gain and simpler matching than do discrete transistors. This 26 dB gain Doherty amplifier uses a conventional 2-way topology, with class AB "main" branch and class C "peaking" branch output stages. A 3GPP 2-WCDMA signal output level of 10 Watts is achieved with 26.4% efficiency and < -40 dBc ACLR and -38 dBc IM3s. When augmented by pre-distortion, 12.5 Watts of 2-WCDMA signal output is produced with < -51 dBc ACLR and -54 dBc IM3s, with 26.8 % efficiency.
Keywords :
hybrid integrated circuits; intermodulation distortion; microwave integrated circuits; microwave power amplifiers; surface mount technology; 10 W; 12.5 W; 2-stage hybrid amplifier modules; 2-way topology; 26 dB; 30 W; 3GPP 2-WCDMA signal; 60 W; Doherty amplifiers; class AB main branch; class C peaking branch; hybrid integrated circuits; intermodulation distortion; microwave power amplifier; surface-mount amplifier modules; Copper; Electromagnetic heating; Gain; Microwave amplifiers; Microwave devices; Microwave transistors; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Thick film circuits;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1516941
